diff --git a/jest.config.js b/jest.config.js
index 88f14e2f..a1301d75 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,5 +1,11 @@
 module.exports = {
-  collectCoverageFrom: ['src/**', '!src/schemata.ts'],
+  collectCoverageFrom: [
+    'src/**',
+    '!src/schemata.ts',
+    '!src/internal/either.ts',
+    '!src/internal/option.ts',
+    '!src/internal/task-either.ts',
+  ],
   preset: 'ts-jest',
   testEnvironment: 'node',
   testMatch: ['<rootDir>/tests/**/*.ts'],